Problem D: Person类与Student类的关系（C++期末）

Problem D: Person类与Student类的关系

Time Limit: 1 Sec Memory Limit: 128 MB
Submit: 623 Solved: 438
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Description

当然，一个student首先是一个person。所以，Student类是Person类的派生类。请定义Person类，包括：

1. 数据成员string name和int age，分别表示姓名和年龄。

2. 构造函数和析构函数，它们有相应的输出，见样例。

3. void show()函数：按照样例输出该对象的name和age属性值。

定义Student类，是Person类的子类：

1. 数据成员int grade，表示学生所在年级。

2. 构造函数和析构函数，它们有相应的输出，见样例。

3. void show()函数：按照样例输出该对象的grade属性值。

Input

只有1行，分为三部分：一个不含空白符的字符串以及两个整数。

Output

见样例。

Sample Input

Tom 19 3

Sample Output

A person Tom whose age is 19 is created.
A student whose grade is 3 is created.
Name is Tom and age is 19.
Grade is 3.
A student whose grade is 3 is erased.
A person Tom whose age is 19 is erased.

HINT

Append Code

append.cc,

int main() 
{ 
    string n; 
    int a, g; 
    cin>>n>>a>>g; 
    Student student(n, a, g); 
    student.Person::show(); 
    student.show(); 
    return 0; 
}

代码如下：

#include <iostream> 
#include <iomanip> 
#include <string> 
#include<cstring> 
using namespace std; 
class Person 
{ 
public: 
    string name; 
    int age; 
public: 
    Person(string _name,int _age) 
    { 
        name = _name; 
        age = _age; 
        cout<<"A person "<<name<<" whose age is "<<age<<" is created."<<endl; 
    } 
    ~Person() 
    { 
        cout<<"A person "<<name<<" whose age is "<<age<<" is erased."<<endl; 
    } 
    void show() 
    { 
        cout<<"Name is "<<name<<" and age is "<<age<<"."<<endl; 
  
    } 
  
}; 
class Student:public Person 
{ 
public: 
    int g; 
public: 
    Student(string _name,int _age,int _g):Person(_name,_age) 
    { 
         g=_g; 
         cout<<"A student whose grade is "<<g<<" is created."<<endl; 
    } 
    void show() 
    { 
        cout<<"Grade is "<<g<<"."<<endl; 
    } 
    ~Student() 
    { 
        cout<<"A student whose grade is "<<g<<" is erased."<<endl; 
    } 
}; 
int main() 
{ 
    string n; 
    int a, g; 
    cin>>n>>a>>g; 
    Student student(n, a, g); 
    student.Person::show(); 
    student.show(); 
    return 0; 
}